Are you following Alex(SSProductions)tutorial? I sort of started everything there, and also had problems moving the legs at first. But then I discovered that you have to delete the IK Chains in s3pe to make them move freely (with the legs and foot). This is what I experienced in my case, i'm not sure if it's the same with you.

By rotating the b_R_Thighs and b_L_Thighs to foot you can move them.

This file here is what I use for my anims. I got this from modthesim. All IK chains have already been removed for this. http://www.mediafire.com/?5en187dkbddv5yb

Thank you for your kind comment! I'm sorry but I can't upload my characters. I hope it won't sound rude, I just want to be protective because they are special to me. I only share them to the people who I really know and trust. I hope you understand D:

I do nothing. Some of the music I choose have no copyright in youtube. Perhaps because they were unpopular. But I did have some small videos that had and got a notice. It is best to choose Free Royalty music for machinimas to have no complications. :)